Determining surface gravities, microturbulences, and effective temperatures via spectroscopic analysis and spectral synthesis of Alpha Centauri A and B, the sun, and Arcturus

John Gilbert Olgin, University of Texas at El Paso

Abstract

I improve upon the existing spectral analysis techniques by introducing a more precise and accurate, semi-empirical method for determining stellar atmospheric parameters. This procedure provides improved stellar metal abundances, effective temperatures, surface gravities and microturbulences for Alpha Centauri A and B, the Sun, and Arcturus by deriving a new model atmosphere for each star in question. This process is compared with results from other empirical and semi-empirical methods. Spectra of Alpha Centauri A and B are obtained form the Spectroscopic Survey of Stars in the Solar neighborhood project (S 4N) by Allende et al. (2004). Spectra of the Sun and Arcturus were obtained from Smith, V. V., 2004 via private communication. Spectra were analyzed using software packages, IRAF and MOOG, and solutions were obtained using an iterative approach to fit model atmospheres of Kurucz (1980) to the spectra yielding the atmospheric stellar parameters in question. This method is an improvement on past methods as it uses measurements of both Fe I and Fe II lines to constrain the model atmospheres. ^

Subject Area

Physics, Astronomy and Astrophysics

Recommended Citation

Olgin, John Gilbert, "Determining surface gravities, microturbulences, and effective temperatures via spectroscopic analysis and spectral synthesis of Alpha Centauri A and B, the sun, and Arcturus" (2006). ETD Collection for University of Texas, El Paso. AAI1435346.
http://digitalcommons.utep.edu/dissertations/AAI1435346

Share

COinS